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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c82b1cb8e319f2f7d8531c202fe11b76e09e2635b7b5f918e93fa6f9649464f9' 
  AND token = '6rKhyO8Zf4tdcOalA0a4ICEVVTCXzN06DAYHFVRlMTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}